The utility model discloses a packing box and belongs to the field of machinery maintenance and repair. The packing box comprises a stuffing box, a short section and an oil pipe buckle head which are sequentially connected from top to bottom. The stuffing box is in a shape of a round pipe, spinal pipe inner threads are arranged on the inner side of the lower end of the stuffing box, and the stuffing box is used for packing filling. The short section is in a shape of a round pipe, the outer diameter of the short section is smaller than the inner diameter of the stuffing box, spinal pipe outer threads are arranged on the outer side of the upper end of the short section, the spinal pipe outer threads of the short section and the spinal pipe inner threads of the stuffing box are matched and used for connection between the short section and the stuffing box, and the short section is used for bearing the packing. The upper end of the oil pipe buckle head is welded with the lower end of the short section, and the lower end of the oil pipe buckle head can be in threaded connection with a well plugging device. The length of the short section is greater than or equal to the depth of the stuffing box. The problems of long packing replacement time and low replacement efficiency are solved, shortening of the packing replacement time and improvement of the replacement efficiency are achieved, and the packing box is used for packing replacement.